Search results
Results from the WOW.Com Content Network
The Precambrian is an informal unit of geologic time, [3] subdivided into three eons (Hadean, Archean, Proterozoic) of the geologic time scale. It spans from the formation of Earth about 4.6 billion years ago ( Ga ) to the beginning of the Cambrian Period, about 538.8 million years ago ( Ma ), when hard-shelled creatures first appeared in ...
The Burgess Shale is a series of sediment deposits spread over a vertical distance of hundreds of metres, extending laterally for at least 50 kilometres (30 mi). [18] The deposits were originally laid down on the floor of a shallow sea; during the Late Cretaceous Laramide orogeny, mountain-building processes squeezed the sediments upwards to their current position at around 2,500 metres (8,000 ...
Skara is a genus of “maxillopod” crustacean known from the Upper Cambrian Orsten deposit of Sweden and similarly aged deposits in China. [2] It is the only genus in the order Skaracarida and family Skaraidae, and contains three species, S. anulata, S. minuta and S. hunanensis.
Fossil of the Miocene-Pleistocene barnacle Concavus Concavus †Concholepas; Conepatus †Conepatus leuconotus; Conomitra †Conorbis; Conus †Conus anabathrum †Conus daucus †Conus delessertii †Conus eversoni – or unidentified comparable form †Conus jaspideus – type locality for species †Conus miamiensis †Conus patglicksteinae ...
Prehistoric crustaceans Cambrian · Ordovician · Silurian · Devonian · Carboniferous · Permian · Triassic · Jurassic · Cretaceous · Paleocene · Eocene · Oligocene · Miocene See also: Category:Extinct crustaceans
Anomalocaris ("unlike other shrimp", or "abnormal shrimp") is an extinct genus of radiodont, an order of early-diverging stem-group marine arthropods.. It is best known from the type species A. canadensis, found in the Stephen Formation (particularly the Burgess Shale) of British Columbia, Canada.
A majority of fossils are from fossil sites in North America and Europe because the group lived primarily in the waters around and within the ancient supercontinent of Euramerica. Only a handful of eurypterid groups spread beyond the confines of Euramerica and a few genera, such as Adelophthalmus and Pterygotus , achieved a cosmopolitan ...
The Cambrian explosion (also known as Cambrian radiation [1] or Cambrian diversification) is an interval of time beginning approximately in the Cambrian period of the early Paleozoic, when a sudden radiation of complex life occurred and practically all major animal phyla started appearing in the fossil record.